Recentering device for elevator control



c. J. ANDERsoNl RECENTERING DEVICE FOR ELEVATOR CONTROL 'Filed March 71923 EINE n ffl/@22140 .042! c/ @if y l iii Patented Apr. 15, 1924.

PATENT OFFICE.

" CARL J. ANDERSON, or CHICAGO, ILLINOIS..

BECEN'IERING DEVICE Fon ELEVA'IOR CONTROL.

Application tiled March 7, 1923. Serial No. 623,358'.

To all 'whom it may concem:

Be it known that I, CARL J. ANDERSON, a. citizen of the Unitedy Statesof America, and airesident oi' Chicago, county of Cook, and State ofIllinois, have invented certain new and useful Improvements` inRecentering Devices for Elevator Control, of which the following is aspecification.

My invention relates to reoentering devices to be used innelevatorcontrol, and has for its object, improvement in such devices. Moreparticularly, my improvement relates tothose elevators which arecontrolled by a rope or cable which passes thru the yelevator car andruns over asheave, the car being moved by an electric motor. If thecurrent from the source should be interrupted and the motor stopped whenthe de-.

vices operated by the cable are in a position to start the motor, theoperator ymight leave the car without kknowing that fact. The object isto prevent the 'motor from starting in case the current again Hows fromthe source until after the cable, and arts controlled thereby, havefbeenreturne to center position. In this connection it should be rememberedthatthere is nothing on or about the cable to indicateto the operatorthe position of :the parts which startend stop the elevator. f l

In the accompanying drawings- Fig. 1 is an elevation ofso much structureas is necessary to an of the present invention; f L

Fig. 2 is a sectionon line 2 2- of Fig. 1; and .y t

Fig. 3 is adiagram of the circuits. f`

The cab-le which passes thru lthe elevator car is shown in dotted: linesat l11, and one of the sheaves over which kit passes is shown in dottedlines at 10. The sheave .10` is secured to a shaft 12,r and also securedto this shaft is an arm 13.

Near the arm 13 is a frame 14 which carries a magnet 15, having anarmature 16 pivoted at 17. Pivoteol` at 18 on the frame 14 is an armv 19having` a roller 20 in the path of the arm 13 when said armis moved backand forth eachside ofits center posi tion as shown in Fig. 3.' IVhen thearm 13 is in the position shown in Fig. 1, and there is no currentfiowing thru the magnet 15, the armature 16 drops by gravity until it isstopped by striking the corner 21 On the post 22 which carries the pivot17, and the arm 19 drops until stopped by engagement with of if theunderstandingk they lug 23 on frame 14. In this position the armature isso far from the pole of the magnet 15 that the attractive force of themagnet kwill not be enough yto raise said armature when a current flowsthru the ma net.. y

eyond the roller 20, the. arm 19 bends upward, as shown at 24, so as tostrike and raise the armature 16 when the end of the arm 13 engages theroller 20 as said arm 13 comesk to its center position. In such raisedposition, the armature 16 is within the range of the magnet, and will beattracted and held provided a current is flowing thru said magnet atsuch time. On the end of the arm 19 beyond 24 is a hook 25, and on the`armature 16 is a hook 26. These parts are so arranged that, when thearm 19 pushes the armature upward, the hook 26 comes under the hook 25.If there is a current flowingthru the magnet 15 at the time, then theattraction of the armature will maintain hook 26Aunder hook 25, and theparts will not fall when the arm 13 moves away from its center position.

Supported on a piece of insulation 27 are Contact terminals 28 and 29,and insulatingly supported on arm 19 is a plate 30. yWhen the arm 19 isatits upper position, the` plate 30 completes connection `between theterminals28 and 29, butwhen the arm 19 drops to its lower position, thisconnection is broken.

Secured to the shaft 12 is a lever 31 having insulated ends 32 and 33adapted to make electrical connections to certain terminalswhen theleveris moved in either direction from its center position. Therelationship ,of thelever 31 vvtothe arm 13 is such that the two are intheir center positions at the same time, as shown in Fig. 3. There is amotor M for driving the elevator, and a solenoid 34 for closingelectrical connections as will be described. There are electricalconnections illustrated in Fig. 3, and which will bel hereinafterdescribed. The magnet 15 is bridged upon the lines 35 and 40 leading tothe source of electric current, but otherwise there is no comp-leteelectrical connection when the lever 31 is in central position.

It will be assumed that there is a current on lines 35 and 40, and thatthe parts stand as in Fig. 3. If the operator on the car pulls the cable11 so as to connect 32 to 48 and 33 to 36 and 41, then a current willflou7 -35-33-36-37-34-38-30-29- 3940- This current thru the solenoid 34connects an electrical connection for the motor lat 45 and a currentflows :#35-33-41-42-31- dt-lldt-LlG--iT-iS-32-l9-4O.

This operates to move the elevator in a direction corresponding to thedirection given to the motor by this current. then f the cable is pulledto stop the car, the circuit is broken vfor both the motor and thesolenoid lVhen the lever 31 is moved to the other extreme, a currentlo\vs:-35L3- 50-37-34-38-30-29--39-40.

This operates the solenoid 3s as before, whereupon a current flows thruthe motor but in a direction reverse to that before, follows35--33-51-16-45-#14-43-hl i2-52-32-l9-40.

Tt is to be not-ed that the solenoid 34 closes the circuit for the motorM, and that the circuit for the solenoid goes thru or includes thecontact 29. It the supply of current thru lines 35 and 40 should be cutofi' at some point outside, then the motor would stop. It' the arm 13 isnot at its center position when this occurs, then the armature 16 andarm 1S) ivill fall down and break the con nection at 29. It the currentthru lines 35 and 40 should be re-established While the arm 13 was ottcenter, the motor circuit would not be re-established, even if the arm13 were far enough oit center to close the connections at 32 and 33. Thereason is that the magnet 15 does not close the connection at contact29, and that connection must be closed before the motor can be started.The magnet is supposed to have power enough to hold the armature when itis in attracted position, but not enough to raise it from retractedposition. However, no harm Would come if the magnet did have enoughpower to raise the armature, because, in that case, the end of the hook26 Woud strike the corner 5ft on the outer end of arm 19. This would inno Way prevent the arm 13 from raising the arm 19.

From the foregoing description it will be seen that for the motor tooperate, the contact 29 must be closed. Also, that this contact isclosed by mechanical means, and is held closed by electrical means.Also, that the mechanical means for closing this contact operates forthat purpose only when at center position and When all other circuitclosing devices are in open condition.

lVhat I claim is:

l. In a recentering device for elevator control, an electric contactinvolved indirectly in the completion of circuits for causing theoperation of the elevator in either direction, other contacts involveddirectly in causing the operation of the elevator, mechanical means forthe closing ot all of said contacts so arranged that the first contactis mechant cally closed when the others are open, and electrical meansfor holding said lirst contact closed independent of the position of themechanical means.

2. In a cable operated elevator control, an electrical connectioninvolved in such control, a mechanical device operated by the cable andserving to mechanically close said connection at any time whenassociated parts are at center position, and electrical means torholding said connection closed when the mechanical device is moved tosome other position, said electrical means being incapable of causingthe closure of said electrical connection.

3. In a cable operated elevator control, an electrical connectioninvolved in the operation of the elevator, an arm arranged to be movedto a position to close said connection, means operated by the cable formoving said arm to close said connection at any time when associatedparts are at center position, and a magnet provided with an armaturearranged to lock said arm in closing position.

f1. The combination with a motor and a. source of electric currenttherefor, of a contact involved in the completion ot' a circuit :tor theoperation of the motor, an arm, mechanical means for moving said arm toclose said contact, a magnet bridged upon the source of current, and anarmature operated by the magnet and serving to lock said arm a-fterbeing moved to closing position by said mechanical means.

5.. The combination with a motor, a source of electric current therefor,and cable operated devices for connecting the motor to the source, of acont-act involved in the completion of a circuit for the motor, an armarranged to be moved to a position to close said contact but normallyacting to open said contact when not held in closed position, meansoperated by the cable for moving the arm to close said contact, a magnetbridged upon the source of current, and an armature operated by themagnet and serving to lock said arm atter it has been moved to closingposition by said cable operated means.

CARL J. ANDERSON.

